Finding the Fourth Proportional to 7,321.60, 10,103.88 and 4,178.80

Step by Step Solution

1. Step 1: Write the proportion equation
   7,321.60 : 10,103.88 = 4,178.80 : x
2. Step 2: Convert to fraction form
   7,321.60/10,103.88 = 4,178.80/x
3. Step 3: Cross multiply
   7,321.60x = 10,103.88 × 4,178.80
4. Step 4: Simplify right side
   7,321.60x = 42,222,093.74
5. Step 5: Solve for x
   x = 42,222,093.74/7,321.60
6. Step 6: Final answer
   x = 5,766.79